fix(docs-site): remove unused notFound import

[eskp]

Summary

• Remove unused notFound import that was causing lint failure

Context

Follow-up to PR #159 which added dynamicParams = false. The notFound import was added but not used since dynamicParams = false handles 404s automatically.

[eskp]

Superseded by middleware fix in staging (commit 270f0a8) which provides a more comprehensive solution by intercepting invalid routes before they reach the page component.